片段未加载

Question

我正在尝试在我的应用程序的两个选项卡之一中使用列表视图扩充片段。

但是，我得到的是这一切：（这将永远持续下去......）

这就是我想要做的。

ListFragment.Java

public class ListFragment extends Fragment {

  Other methods 
   ...
  //some code

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment


        java.util.List<HashMap<String, String>> aList = new ArrayList<HashMap<String,String>>();

        for(int i=0;i<len;i++){
            HashMap<String, String> hm = new HashMap<String,String>();
            hm.put("tit", "Title : " + title[i]);
            hm.put("init","Initial Price : " + cur_price[i]);
            hm.put("cur","Current Price  : " + init_price[i]);
            hm.put("img", d[i].toString());
            aList.add(hm);
        }



        // Keys used in Hashmap
        String[] from = { "tit","init","cur","img"};

        // Ids of views in listview_layout
        int[] to = { R.id.tit,R.id.init,R.id.cur,R.id.img};

        // Instantiating an adapter to store each items
        // R.layout.listview_layout defines the layout of each item
        SimpleAdapter adapter = new SimpleAdapter(context, aList, R.layout.listview_layout, from, to);

        // Getting a reference to listview of fragment_list_items.xml layout file
        ListView listView = ( ListView ) view.findViewById(R.id.listview);

        // Setting the adapter to the listView
        listView.setAdapter(adapter);

        return inflater.inflate(R.layout.fragment_list_items, container, false);

    }

请问是哪里出了问题？

编辑： 当我没有标签但只有一个 activity 要显示时，相同的代码运行良好。

我的布局文件：

fragment_list_items.xml :

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" tools:context="com.example.nikhil.amazon1.ListFragment">

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

</FrameLayout>

ListView.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    >

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription=""
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
        <TextView
            android:id="@+id/tit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            />

        <TextView
            android:id="@+id/init"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            />

        <TextView
            android:id="@+id/cur"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            />
    </LinearLayout>
</LinearLayout>

Answer 1

首先，您必须通过 inflater 创建视图，因为您无法从中找到 ItemById。并重命名您的 class。 ListFragment -> otherName.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment

    View view = inflater.inflate(R.layout.fragment_list_items, container, false)

    java.util.List<HashMap<String, String>> aList = new ArrayList<HashMap<String,String>>();

    for(int i=0;i<len;i++){
        HashMap<String, String> hm = new HashMap<String,String>();
        hm.put("tit", "Title : " + title[i]);
        hm.put("init","Initial Price : " + cur_price[i]);
        hm.put("cur","Current Price  : " + init_price[i]);
        hm.put("img", d[i].toString());
        aList.add(hm);
    }



    // Keys used in Hashmap
    String[] from = { "tit","init","cur","img"};

    // Ids of views in listview_layout
    int[] to = { R.id.tit,R.id.init,R.id.cur,R.id.img};

    // Instantiating an adapter to store each items
    // R.layout.listview_layout defines the layout of each item
    SimpleAdapter adapter = new SimpleAdapter(context, aList, R.layout.listview_layout, from, to);

    // Getting a reference to listview of main.xml layout file
    ListView listView = ( ListView ) view.findViewById(R.id.listview);

    // Setting the adapter to the listView
    listView.setAdapter(adapter);

    return view;

}

Answer 2

我也遇到了这个问题。您可能需要片段元素而不是框架布局。您可以尝试在 fragment_list_items.xml

中使用

片段未加载

Fragment not loading

android

android-listview

simpleadapter

android-fragments

pagerslidingtabstrip